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<meta charset="utf-8">
<title>'letter-spacing' property</title>
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<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/testhelper.js"></script>
<script src="resources/testsuite.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

function assert_is_equal_with_zero_special_handling(input, result) {
  let is_zero_length = true;
  if (input instanceof CSSMathSum) {
    for (let operand of input.values)
      is_zero_length &&= (operand.value == 0);
  } else
    is_zero_length = input.value == 0;

  // Per the specification, a computed letter-spacing of zero yields a resolved value (getComputedStyle()
  // return value) of normal.
  if (is_zero_length)
    assert_style_value_equals(result, new CSSKeywordValue("normal"));
  else
    assert_is_unit('px', result); // Same check as in testsuite.js
}

runPropertyTests('letter-spacing', [
  { syntax: 'normal' },
  {
    syntax: '<length>',
    computed: assert_is_equal_with_zero_special_handling
  },
  { syntax: '<percentage>' },
]);

</script>
